diff options
| author | Mischa Jonker <mischa.jonker@synopsys.com> | 2013-07-26 14:08:14 +0200 |
|---|---|---|
| committer | Pantelis Antoniou <panto@antoniou-consulting.com> | 2013-09-20 18:59:11 +0300 |
| commit | 2136d22630ef5acf36b90c45b6e44e964547b618 (patch) | |
| tree | 900e73dfa0629d6a3f3739322c9ad3d32ddfe653 /drivers | |
| parent | da61fa5f42133593be51764b55a905330eae5063 (diff) | |
mmc/dw_mmc: Fix DMA descriptor corruption
In dwmci_prepare_data, the descriptors are allocated for DMA transfer.
These are allocated using the ALLOC_CACHE_ALIGN_BUFFER. This macro uses
the stack to allocate these descriptors. This becomes a problem if the
DMA transfer continues after the processor leaves the function in which
the descriptors were allocated.
Therefore, I have moved the allocated of the buffers up one level, to
dwmci_send_cmd(). The DMA transfer should be complete when leaving this
function.
Signed-off-by: Mischa Jonker <mjonker@synopsys.com>
Cc: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Jaehoon Chung <jh80.chung@samsung.com>
Cc: Andy Fleming <afleming@gmail.com>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Acked-by: Pantelis Antoniou <panto@antoniou-consulting.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mmc/dw_mmc.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c index a82ee17a25..796a811876 100644 --- a/drivers/mmc/dw_mmc.c +++ b/drivers/mmc/dw_mmc.c @@ -41,12 +41,11 @@ static void dwmci_set_idma_desc(struct dwmci_idmac *idmac, } static void dwmci_prepare_data(struct dwmci_host *host, - struct mmc_data *data) + struct mmc_data *data, struct dwmci_idmac *cur_idmac) { unsigned long ctrl; unsigned int i = 0, flags, cnt, blk_cnt; ulong data_start, data_end, start_addr; - ALLOC_CACHE_ALIGN_BUFFER(struct dwmci_idmac, cur_idmac, data->blocks); blk_cnt = data->blocks; @@ -111,6 +110,8 @@ static int dwmci_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data) { struct dwmci_host *host = (struct dwmci_host *)mmc->priv; + ALLOC_CACHE_ALIGN_BUFFER(struct dwmci_idmac, cur_idmac, + data ? data->blocks : 0); int flags = 0, i; unsigned int timeout = 100000; u32 retry = 10000; @@ -127,7 +128,7 @@ static int dwmci_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, dwmci_writel(host, DWMCI_RINTSTS, DWMCI_INTMSK_ALL); if (data) - dwmci_prepare_data(host, data); + dwmci_prepare_data(host, data, cur_idmac); dwmci_writel(host, DWMCI_CMDARG, cmd->cmdarg); |